Through the voltage transformer (PT), high voltage (such as 10kV, 35kV) is proportionally converted to low voltage (such as 100V) for use by instruments, protection devices, and electricity meters. The circuit breaker's fuse provides protection for the voltage. This page gives me a complete, practical view of a high-voltage PTC cabin heater module – from power-stage topology, sensing and protection through to diagnostics, layout and BOM planning – so I can make clear engineering and procurement decisions instead of guessing at device ratings and safety. Also known as the power receiving cabinet, it is a device used to receive electric energy from the power grid (from the incoming line to the busbar), generally installed with circuit breakers, CT, PT, isolation knives and other components. The following is a detailed description of its function and composition: Voltage Measurement and. Electrical busbar systems (sometimes simply referred to as busbar systems) are a modular approach to electrical wiring, where instead of a standard cable wiring to every single electrical device, the electrical devices are mounted onto an adapter which is directly fitted to a current carrying. The PT cabinet, also known as the potential transformer cabinet, is a key device in the power system used for monitoring the bus voltage and providing voltage signals for protection and metering devices. Its components mainly include the following categories: ### I.